[Why] Need to do atomic check first, then validate global state. If not, when connecting both MST and HDMI displays and set a bad mode via xrandr, system will hang.
[How] Move drm_dp_mst_atomic_check() to the front of dc_validate_global_state(). Signed-off-by: Zhan Liu <[email protected]> --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index eed3ed7180fd..805d8d84ebb8 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -8256,6 +8256,16 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev, goto fail; #endif + /* + * Perform validation of MST topology in the state: + * We need to perform MST atomic check before calling + * dc_validate_global_state(), or there is a chance + * to get stuck in an infinite loop and hang eventually. + */ + ret = drm_dp_mst_atomic_check(state); + if (ret) + goto fail; + if (dc_validate_global_state(dc, dm_state->context, false) != DC_OK) { ret = -EINVAL; goto fail; @@ -8284,10 +8294,6 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev, dc_retain_state(old_dm_state->context); } } - /* Perform validation of MST topology in the state*/ - ret = drm_dp_mst_atomic_check(state); - if (ret) - goto fail; /* Store the overall update type for use later in atomic check. */ for_each_new_crtc_in_state (state, crtc, new_crtc_state, i) { -- 2.17.1 _______________________________________________ amd-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/amd-gfx
